A new use of "duh?"

From the Pittsburgh Post-Gazette, 7/1/1990: "As a Teenage
Mutant Ninja Turtle might say, "No duh!""
I don't know if the Teenage Mutant Ninja Turtles actually
originated or popularized the phrase. TMNJ first appeared in a comic
book in 1984 and in a television cartoon in 1987.
An earlier but perhaps less enlightening use from Google Groups,
8/1/1988: "Model size set to Huge, Test Stack Overflow ON (no duh)"
John Baker
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